Hi,
I have the thesis that this character and this one : https://www.geni.com/people/Francisco-de-la-Concepción-Isla-Alonso/... are brothers. They share very similar parents. However, there are not still enough to confirm.
I would like to contact any one of you which has evidences about this person to double check if the match can be confirmed.
Looking to FamiliySearch, that connection has been performed: https://www.familysearch.org/tree/person/KCX8-1C2/details